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题文

- Air_______ is one of the biggest problems in the world today
- Yes. We must take action to make the air less_______.

A.pollution; pollution B.pollute; pollution
C.pollution; pollute D.pollution; polluted
科目 英语   题型 单选题   难度 中等
知识点: 主语+系动词+表语 名词作定语
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